28444280 has 32 divisors (see below), whose sum is σ = 64668240. Its totient is φ = 11258880.

The previous prime is 28444279. The next prime is 28444289. The reversal of 28444280 is 8244482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28444289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215 + ... + 7545.

Almost surely, 2^28444280 is an apocalyptic number.

28444280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28444280 is an abundant number, since it is smaller than the sum of its proper divisors (36223960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28444280 is a wasteful number, since it uses less digits than its factorization.

28444280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439 (or 7435 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The square root of 28444280 is about 5333.3179166444. The cubic root of 28444280 is about 305.2565430905.

The spelling of 28444280 in words is "twenty-eight million, four hundred forty-four thousand, two hundred eighty".